ASME SB338 Grade 7 Titanium Tube Ti-0.2Pd Titanium Alloy Steel Heat Exchanger Tube
ASTM B338 / ASME SB338 Grade 7 / Ti-0.2Pd / R52400 Titanium Tube Seamless Heat Exchanger Tube
Choose ASME SB338 Grade 7 (Ti-0.2Pd) for heat exchanger tubes when:
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You need excellent resistance to chlorides (including high temperature).
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The fluid contains dilute reducing acids (e.g., <5% HCl, <10% H₂SO₄) up to ~150°C.
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You have tight crevices (e.g., tube-to-tubesheet, gaskets) in hot brine or acidic-chloride service.
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You want to avoid exotic nickel alloys (C276, C22) for cost or availability reasons, but Grade 2 does not pass corrosion tests.
Chemical Composition of ASME SB338 Grade 7 Titanium Tube / Ti-0.2Pd Titanium Alloy Steel Heat Exchanger Tube
| Element | Chemical Composition % | ||||||||
| Grade 1 | Grade 2 | Grade 3 | Grade 5 | Grade 7 | Grade 9 | Grade 11 | Grade 12 | Grade 23 | |
| Nitrogen, max | 0.03 | 0.03 | 0.05 | 0.05 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Carbon, max | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| Hydrogen, max | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.0125 |
| Iron, max | 0.20 | 0.30 | 0.30 | 0.40 | 0.30 | 0.25 | 0.20 | 0.30 | 0.25 |
| Oxygen, max | 0.18 | 0.25 | 0.35 | 0.20 | 0.25 | 0.15 | 0.18 | 0.25 | 0.13 |
| Aluminum | … | … | … | 5.5-6.75 | … | 2.5-3.5 | … | … | 5.5-6.5 |
| Vanadium | … | … | … | 3.5-4.5 | … | 2.0-3.0 | … | … | 3.5-4.5 |
| Tin | … | … | … | … | … | … | … | … | … |
| Ruthenium | … | … | … | … | … | … | … | … | … |
| Palladium | … | … | … | … | 0.12-0.25 | … | 0.12-0.25 | … | … |
| Molybdenum | … | … | … | … | … | … | … | 0.2-0.4 | … |
| Chromium | … | … | … | … | … | … | … | … | … |
| Nickel | … | … | … | … | … | … | … | 0.6-0.9 | … |
| Niobium | … | … | … | … | … | … | … | … | … |
| Ziconium | … | … | … | … | … | … | … | … | … |
| Silicon | … | … | … | … | … | … | … | … | … |
| Residuals, max each | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Residuals, max total | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Titanium | balance | balance | balance | balance | balance | balance | balance | balance | balance |
Mechanical Property of ASME SB338 Grade 7 Titanium Tube / Ti-0.2Pd Titanium Alloy Steel Heat Exchanger Tube
| Grade | Tensile Strength, min | Yield Strength (0.2% Offset) | Elongation 2 in. or 50 mm | |||||
| min | max | |||||||
| Ksi | (Mpa) | Ksi | (Mpa) | Ksi | (Mpa) | gage length min % | ||
| Grade 1 | 35 | (240) | 25 | (170) | 45 | (310) | 24 | |
| Grade 2 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
| Grade 3 | 65 | (450) | 55 | (380) | 80 | (550) | 18 | |
| Grade 5 | 130 | (895) | 120 | (828) | … | … | 10 | |
| Grade 7 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
| Grade 9 | 90 | (620) | 70 | (483) | 45 | … | 15 | |
| Grade 11 | 35 | (240) | 25 | (170) | … | (310) | 24 | |
| Grade 12 | 70 | (483) | 50 | (345) | … | … | 18 | |
| Grade 23 | 120 | (828) | 110 | (759) | … | … | 10 | |
Application
1. Chemical Process Heat Exchangers
2. Desalination & Brine Heaters
3. Offshore Oil & Gas
4. Pulp & Paper Industry
5. Pharmaceutical & Fine Chemical6. Hydrometallurgy & Mining
7. Replacement / Upgrade Applications
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